Answer to first question. That's hard to say for sure. How we normally check the oil/vapor seperator is with a tool called a manometer. My shop is new and that is an old tool so we do not have one. We hook up the tool to the oil fill port and run the engine.
2nd question. There is a hose that runs across for intake manifold that eventually hooks to the intake manifold. So you would have unmeter air that way. I normally don't see internal leaks but it does happen.
Do you know if the TVV fault is stuch open or close. If stuck open replace the TVV, this may be your problem.
Sorry, I don't have too much more information for you. I hope you figure it out.
Thanks Hikin, I realize we're about as far as we can go here;
As for Q1 on the Oil Separator: The use of a manometer implies a comparative vaccum measurement at a very low level measured in "inches of water" typically (full vaccum being 28 inches of H2O if I recall. One end to the oil fill, the other end to another location......where? Because if it's to atmosphere, mine will suck full intaker manifold vaccum based on my estimation comparing at various points in the intake.
As for the TVV: the code doesn't speak to open or closed, but the vale is closed tight out of the car, and in the car with the engine at idle or turned off. So I'm assuming that it is "normally closed" requiring a signal voltage to open. If this signal is intermittantly applied by the ECU under some set of conditions and the valve failed to open.....then it triggers a code. But that's a different issue. I'll pull it again and apply 12V to see if it operates and closes.....and I guess I could just replace it.......but it doesn't look like the issue.
Back to the Oil/Vapor: can you refer me to, or post the manometer test and the desired vaccum differential so I can check mine t6hat way? I've not seen this test in the BMW manual.....I'm suspicious of that item but trying to avoid the cost/effort of swapping that part and hoses unless it is confirmed.
Thanks again.
PS: pls PM me you business and contact info. My sister lives in Sacramento and has a whole fleet of BMW/Porsche that deserves good indy care.
Mike
